T.J. Mercier 1bf67c8fdb cgroup/cpuset-v1: Add missing support for cpuset_v2_mode ... Android has mounted the v1 cpuset controller using filesystem type "cpuset" (not "cgroup") since 2015 [1], and depends on the resulting behavior where the controller name is not added as a prefix for cgroupfs files. [2] Later, a problem was discovered where cpu hotplug onlining did not affect the cpuset/cpus files, which Android carried an out-of-tree patch to address for a while. An attempt was made to upstream this patch, but the recommendation was to use the "cpuset_v2_mode" mount option instead. [3] An effort was made to do so, but this fails with "cgroup: Unknown parameter 'cpuset_v2_mode'" because commit e1cba4b85d ("cgroup: Add mount flag to enable cpuset to use v2 behavior in v1 cgroup") did not update the special cased cpuset_mount(), and only the cgroup (v1) filesystem type was updated. Add parameter parsing to the cpuset filesystem type so that cpuset_v2_mode works like the cgroup filesystem type: $ mkdir /dev/cpuset $ mount -t cpuset -ocpuset_v2_mode none /dev/cpuset $ mount|grep cpuset none on /dev/cpuset type cgroup (rw,relatime,cpuset,noprefix,cpuset_v2_mode,release_agent=/sbin/cpuset_release_agent) [1] b769c8d24f [2] https://cs.android.com/android/platform/superproject/main/+/main:system/core/libprocessgroup/setup/cgroup_map_write.cpp;drc=2dac5d89a0f024a2d0cc46a80ba4ee13472f1681;l=192 [3] https://lore.kernel.org/lkml/f795f8be-a184-408a-0b5a-553d26061385@redhat.com/T/ Fixes: e1cba4b85d ("cgroup: Add mount flag to enable cpuset to use v2 behavior in v1 cgroup") Signed-off-by: T.J. Mercier <tjmercier@google.com> Acked-by: Waiman Long <longman@redhat.com> Reviewed-by: Kamalesh Babulal <kamalesh.babulal@oracle.com> Acked-by: Michal Koutný <mkoutny@suse.com> Signed-off-by: Tejun Heo <tj@kernel.org>		2025-04-17 07:32:53 -10:00
..
cgroup-internal.h	cgroup: Print message when /proc/cgroups is read on v2-only system	2025-03-11 09:22:54 -10:00
cgroup-v1.c	Driver core updates for 6.15-rc1	2025-04-01 11:02:03 -07:00
cgroup.c	cgroup/cpuset-v1: Add missing support for cpuset_v2_mode	2025-04-17 07:32:53 -10:00
cpuset-internal.h	cgroup/cpuset: Don't allow creation of local partition over a remote one	2025-03-31 13:26:53 -10:00
cpuset-v1.c	RFC cgroup/cpuset-v1: Add deprecation messages to sched_relax_domain_level	2025-03-11 09:22:54 -10:00
cpuset.c	cgroup/cpuset: Fix race between newly created partition and dying one	2025-04-01 21:46:22 -10:00
debug.c	kernel: cgroup: fix misuse of %x	2019-05-06 08:47:48 -07:00
dmem.c	cgroup/dmem: Don't open-code css_for_each_descendant_pre	2025-02-19 09:50:37 +01:00
freezer.c	cgroup/freezer: Add cgroup CGRP_FROZEN flag update helper	2024-10-23 09:45:09 -10:00
legacy_freezer.c	cgroup: Add deprecation message to legacy freezer controller	2025-03-11 09:22:54 -10:00
Makefile	kernel/cgroup: Add "dmem" memory accounting cgroup	2025-01-06 17:24:38 +01:00
misc.c	cgroup/misc: Remove unused misc_cg_res_total_usage	2025-01-28 09:00:54 -10:00
namespace.c	cgroup:namespace: Remove unused cgroup_namespaces_init()	2023-08-14 14:29:47 -10:00
pids.c	cgroup/pids: Remove unreachable paths of pids_{can,cancel}_fork	2024-08-05 10:32:16 -10:00
rdma.c	rdmacg: fix kernel-doc warnings in rdmacg	2023-06-05 09:45:14 -10:00
rstat.c	cgroup: rstat: call cgroup_rstat_updated_list with cgroup_rstat_lock	2025-04-01 07:33:26 -10:00